Causes of Common Problems in Spiral Tube Production
Release date:
2021-06-08
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What are the common causes of production problems in spiral tubes? During smelting or hot working, certain factors—such as non-metallic inclusions, gases, improper process selection, or operator error—can give rise to defects within the steel or on its surface. These defects can severely compromise material or product quality and, in some cases, lead to scrap.
Spiral tube What are the common causes of production problems? During smelting or hot working, spiral tubes may develop internal or surface defects due to factors such as non-metallic inclusions, gas entrapment, improper process selection, or operator error, which can severely compromise material or product quality and, in some cases, lead to scrap.
Common defects and their causes in spiral welded steel pipes: looseness, porosity, shrinkage cavities and slag inclusions, non-metallic inclusions, segregation, white spots, cracks, and various abnormal fracture defects can all be detected through macroscopic examination. There are two types of macroscopic inspection: acid‑etching inspection and fracture inspection. Below is a brief introduction to the common macroscopic defects revealed by the acid‑etching method:
1. Causes of segregation in spiral tubes:
During casting and solidification, selective crystallization and diffusion can lead to the segregation of certain elements, resulting in chemical non-uniformity. Depending on the location of the segregation, it can be classified into ingot segregation, center segregation, and point segregation.
Macroscopic characteristics
When the macroscopic feature is an acid‑leached sample and the segregation consists of etchable or gaseous inclusions, it appears dark in color, with an irregular shape, slightly depressed, a flat base, and numerous dense microporous spots. If it is a corrosion‑resistant component, it exhibits lighter coloration, irregular shapes, and smoother, slightly raised micro‑protrusions.
2. Causes of porosity in spiral tubes
During hot working, steel cannot be welded due to gaps caused by the solidification shrinkage of low-melting-point materials and the release of gases. Based on the nature of their distribution, these gaps can be classified into two types: center‑management type and generally loose type.
Macroscopic characteristics
On the laterally thermally acid‑leached surface, the pores are irregular polygons with narrow pits at their bases; this distinct pit morphology often gives rise to greater segregation, and in severe cases, the pits may coalesce into a sponge‑like structure.
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